The article does not say Amazon commingled glasses from multiple sources.
Before I purchased eclipse glasses from Amazon, I first checked with NASA for approved brands, purchased an approved brand, and have not received a recall email from Amazon.
The fact is that we don't know what happened at Amazon, whether they commingled inventory or incorrectly included legitimate suppliers in the recall or if there were real issues with the products provided by the supplier in the article.
Short of an elaborate test apparatus, there is actually no way for a consumer to independently confirm they have safe glasses.
It's easy to make fakes that look exactly like the real thing. So a printed ISO code or brand name is only sufficient if the supply chain is secure.
And unfortunately, there have been plenty of stories lately about seeming lax stock management at Amazon that makes it hard to know exactly what you're going to get.
True, but we know that inventory commingling is an issue in general for Amazon so it seems reasonable to assume they have done so in this case given that there are two vendors cited who provided strong claims to have been selling proper product, but were still subject to the recall.
I ordered a variety of different products and so I can see which were recalled and which were not. Based on that sample my guess is that they recalled anything with the text "solar eclipse" in the description that they could not conclusively prove complied with the relevant human-eye exposure standards which include manufacturing, documentation and tractability requirements. This would have caught : truly unsafe product; safe product that lacked the necessary paper trail; safe product that wasn't manufactured in the approved facility; product that was never marketed for human eye protection; compliant product that couldn't be separated from the above categories due to Amazon inventory commingling.
Before I purchased eclipse glasses from Amazon, I first checked with NASA for approved brands, purchased an approved brand, and have not received a recall email from Amazon.
The fact is that we don't know what happened at Amazon, whether they commingled inventory or incorrectly included legitimate suppliers in the recall or if there were real issues with the products provided by the supplier in the article.